<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <div id="app"></div>

    <!-- 通过CDN引入Vue -->
    <script src="https://unpkg.com/vue@next"></script>
    <script>
      const fh = {
        template: `<h2>Hello world</h2>`
      }

      const app = Vue.createApp(fh)
      /* 通过mount方法挂载元素 */
      app.mount('#app')
    </script>
  </body>
</html>
